Properties of the Number 64881

Sixty-Four Thousand Eight Hundred Eighty-One

Basics

Value: 64880 → 64881 → 64882

Parity: odd

Prime: No

Previous Prime: 64879

Next Prime: 64891

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁶ × 89

Divisors: 1, 3, 9, 27, 81, 89, 243, 267, 729, 801

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111110101110001

Octal: 176561

Duodecimal: 31669

Hexadecimal: fd71

Square: 4209544161

Square Root: 254.7174905655283

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers D such that D² = A³ + B⁴ + C⁵ and A² + B³ + C⁴ = d² for some positive integers A, B, C, d. A256613

a(0)=1, a(1)=1, a(n) = 9·a(n/2) for even n >= 2, and a(n) = 8·a((n-1)/2) + a((n+1)/2) for odd n >= 3. A116526

Expansion of g.f. 1/((1-x²+x³+x⁴-x⁵)*(1-x-x²+x³-x⁵)). A147598

Ordered factorizations with one level of parentheses indexed by prime signatures. A050354(A025487). A50355

Totally multiplicative sequence with a(p) = a(p-1) + 8 for prime p. A166705

McKay-Thompson series of class 30a for Monster. A58619

Indices of primes in sequence defined by A(0) = 17, A(n) = 10·A(n-1) + 27 for n > 0. A102034

Numbers k such that the concatenation of k with 4·k gives a square. A115535

Numbers k that divide ∑_j∣k j^k/j. A343982

Eisenstein array Ei(1,2). A64881